Roller-mill



(No Model.) 4. Sheets-Sl1eet 1.

J. D. MILLAR. ROLLER MILL.

No. 311,508. Patent d Fe N. PETERS, Plwlu-Lnhogmplvcr, Wnnhing'on, n. c.

4 Sheets-Sheet 2.

(No Model.)

J. D. MILLAR.

ROLLER MILL.

No. 811,508. I Patented Feb.

iz aa i I i I N. PETERS. PiMo-Lnhognpher. Waxhingu (No Model.) Sheets-Sheet a.

J. DQMILLAR.

' ROLLER MILL.

,e nted Feb. 3,1885.

HIIIIIIII I l I I Hii' (No Model.) 4 Sheets-Sheet 4.

J. D. MIL-LAB.

ROLLER MILL.

No. 311,508. Patented Feb. 3, 1885.

UNITED S ratus PATENT Unmet.

JAMES D. MILLAR, OF MILWAUKEE, VISCONSIN.

ROLLER-MILL.

SPECIFICATION forming part of Letters Patent No. 311,508, dated February 3, 1885. Application filed April '28, 1884. (No model.)

To all whom it may concern: v

Be it known that I, JAMES D. llIILLAR, a citizen of the United States, residing at Mil- Waukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful Improvementsin Roller-Mills, and I do hereby declare the following to be a full, clear,

, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

My invention is explained by reference to the accompanying drawings, in which Figure 1 represents a side view of myimproved rollermill,looking toward the ends ofthe rolls. Fig. 2 is an end view. Fig. 3 is a vertical section of the hopper, showing the agitators. Fig. 4 is a top view of the hopper. Fig. 5 is anend View of one pair of the grinding-rolls, showing the scraping devices by which the mate rial is prevented from adhering to the surfaces of the rolls. Fig. 6 is a front view of the devices shown in Fig. 5. Fig. 7 represents a side view of the machine with the hopper removed, showing more particularly the arrangement of the belt-pu1leys and belts. Fig. 8 represents an end view of Fig. 7. Fig. 9 represents an end View of the devices for attaining both the horizontal and vertical adjustmentof the grinding-rolls, one end only of one of each pair of rolls being provided with such adjusting devices. Fig. 10 represents a front and Fig. 11 a top view of Fig. 9. Fig. 12 represents a side view, and Fig. 13 a top view, of the devices for simu1tane-' ously closing and opening the throat of the hopper. Fig. 14 represents the belts and beltpulleys for operating the agitator and feedrolls. Fig. 15 represents a side and Fig-.16 an end View of the automatically closing door in its closed position. Fig. 17 represents a side and Fig. 18 a top view of the automatically-closin g door open. Figs. 19 and 20 show the position of the driving-belts and the loose pulleys E and O on the respective sides of the machine.

Like parts are represented by the same reference-letters throughout the several views.

These improvements mentioned are shown in connection with the so-called double-roller mill, or that class of mill in which two pairs of grinding or reducing rolls of like con: struction and capacity are used in connection with a double hopper and single supporting frame or shell. Most of the improvements shown are, however, as well adapted to be used with the so-called single-roller mill, or mill having but a single pair of reducingrolls, while others are adapted to be used only in the former class, or so-called double-roller mills.

A is a substantial cast-metal shell, which serves the twofold purpose of a frame to the mill and a receptacle for the ground material which falls into it from the grinding-rolls, and from which it escapes through an opening in its bottom.

B is the hopper, into which the grain is conducted preparatory to grinding. The hopper B is divided into two compartments by the partitions O, which diverge toward the ends E E.

D I) are the feed-throats through which the grain escapes from the hoppers.

F F are adjustable feed rolls, which are adapted to be so adjusted in the throats as to regulate and govern the escape of grain from the hopper, or entirely stop the grain, thus serving the threefold purpose of stopping the escape of grain, of governing the quantity of grain which escapes, and acting as agitators to prevent the grain from stopping up the throats. The feed-rolls are supported upon the downward-projecting arms G G of the levers S S. The levers S S are pivoted upon the bolts H H. The upward-projecting arms I of the levers S are both connected to the arm J by rods K K, whereby they are both simultaneously operated by the movement of said arm. The arm J is fitted to an eccentric or cam, L, by which it is moved upward and downward in a vertical line as said eccentric is turned. The eccentric L is rigidly affixed to shaft M, which shaft has its support in the sides of the hopper, across which it extends. Upon the opposite end of the shaft M is also provided an eccentric or cam and arm,J which arm is in like manner connected by rods and levers with the opposite ends of the feed-rolls, as shown in Fig. 13.

To one end of the shaft Mis attached ahandle, N, by which said feed-rolls are moved and adjusted. When said handle is thrown toward the right, the arms J upon both sides of the hopper are moved upward by the cams L, whereby the rods K K and arms I I on both sides of the machine are moved upward and outward, and the arms G G and the respective shafts O O of the feed-rolls F F are moved downward and away from the throats of the hopper, thereby permitting the escape of grain. By a reverse movement of said handle said feed-rolls are moved upward and the throats of the hopper closed. The rods K are formed in two parts, which are connected together by the cylindrical nuts '1 operating on screw-threads. The threads on said nuts and rods are so formed as to cause the parts of said rods to be drawn toward each other by turning said nuts in one direction,and to be separated by turning said nuts in the opposite direction, whereby said rods may be extended or contracted, as may be required, in adj usting the feed-rolls to regulate the escape of grain. The upper ends of the arms J are provided with slots or guideways U, through which project stationary pins V, which pins serve to hold the upper ends of said arms in place and prevent them from turning as they are raised and lowered by the action of the cams or eccentrics L. The shafts O of the feed-rolls are each provided with pulleys PP. Motion is communicated to said shafts O and feed-rolls through band-pulley Q, belt A,.pulley P,.pullcy O, belt B, and pulley P. The belt A is, when released from the action of a belt-tightener, so slack that it ceases to coinmunicate motion to said feed-roll. The belttightener consists of pulley Dand arm E. The arm Eis rigidly affixed to the shaft M, and the tightener-pulley is thrown out of and in contact with the belt A as the handle N is moved toward the right and left. Thus it is obvious that the same movement of the handle which opens the throats of the hopper throws the bandtightener in contact with the belt and starts the feed-rolls, and that the reverse movement of the handle simultaneously closes the hopper-throats and stops the feedrolls.

In addition to the eccentrics L, two other eccentrics, F F, are attached to said shaft M,

which are respectively connected by the rods K K to the upper ends of the arms G G. The

arms G Gare supported at their lower ends upon pivotal bolts H H, which permit their upper ends to be moved slightly toward the right and left, as required when throwing one of each pair of grinding-rolls 1 l (which are supported thereby) toward and from the other. The eccentrics F F project in opposite directions from opposite sides of the shaft M, whereby as the handle is moved the arms G Gwith their rolls are moved in opposite directions to each other. Thus as the handle is thrown toward the right the following th rce separate objects are attained, viz: The hopper is opened, the feed-rolls are started in their rotary movement, and the grinding-rolls are moved toward each other in position for grinding, and when the handle is thrown toward the left the feed-rolls are thrownup into the throats of the hopper, thereby closing them. The band-tightener is thrown back from the band and the feed-rolls stopped, while the grinding-rolls are separated from each other. The rollers J are supported at each end in stationary journal-boxes L, and the required adjustment of the rolls to each other for producing the various reductions is attained by moving the rolls I. In addition, therefore, to the temporary movement given to therollers 1' whenever the mill is stopped by the action of the handle N, a so-called permanent adeasily regulated and t-he'finest adjustment that may be required is readily made.

Between the bearing-surfaces of the inner hand-nuts and the opposite bearings of the arms G are interposed spiral springs N,which IOO permit said arms G and rolls I to moveslightly away from the outer or stationary rolls, J, as may be required to permit of hard foreign substances passing between the rolls.

In addition to the horizontal adjustment of the rolls 1 described, it is necessary to provide for a vertical adjustment of one end of said rolls 1, whereby the point of contact of the peripheries of said rolls 1 and J may be brought to and retained in the same plane. To accomplish this object a movable eccentric j ournal-box, O, is provided at one end of each of said movable rolls 1 for the reception of the shafts P", one of which is shown in Fig; 10. The exterior surfaces of the journalboxes 0 are spherical in shape at their centers, as shown in Fig. 10, and are fitted to stationary bearings Q, provided therefor in the arms G. The openings through said movable journal-boxes 0 being formed eccentric thereto, it is obvious that while the peripheries of said movable journal-boxes remain, when turned, upon the same plane the ee centric journal-bearings therein are thrown either above or below the cen ter,or at any intermediate point between the extreme upward and downward movement desired, whereby the ends of the roller-shafts therein are raised or lowered, and thereby adjusted at any desired point which may be required to bring the point of contact of the rolls 1 upon th same plane with that of the rolls J.

It is obvious that owing to the spherical IIO plicated and fitted to and retained in their bearings in the supporting-arms.

In making the mill the rollsare arranged as nearly parallel to each other as possible, and the vertical adjustment described becomes necessary only to correct some slight variation of the rolls in this respect as may arise by the wearing of the journal-bearings or the peripheries of the rolls, and it is obvious that to make such correction and bring the rolls parallel to eachother it becomes necessary to move but one end of one roll only. \Vhen the rolls are thus adjusted parallel to eachother, such adjustment'remains permanent,

, While the movable rolls are moved bodily toward and'froni the other horizontally by the means described without changing the relative distances between their ends. Thcjourrial-box at the opposite end of said roll-shatt is also spherical in shape, like that shown in section in Fig. 10, and is adapted to turn in its bearings in the supporting-arm to conform to the inclination of the shaft as the eccentric journal-box is turned. The projecting ends of the eccentric journal-boxes 0' are made angular, to permit of the application of a wrench or instrument foradjusting them. When all justed, the journal-boxes may be rigidly attixed at such point by the set-screws B, Fig. 9.

S is a pulley-shat't, located below the floor, from which motion is communicated by two separate pulleys, T and W, and belts U and V, to opposite ends of the machine. The belt U passes around the pulley T, and from thence up through the floor, diverging toward the right and left, passing over the pulleys Aand B", and from thence down around and beneath the flanged loose pulley-rim (3, whereby, as said band revolves, it drives one of each pair otgrinding-rolls, causing them to rotate in the same direction toward the left, while the other two rolls are driven in the same direction toward the right by the band V. which passes around thepulley-W, and from thence between and against the pulleys D and E, and around the loose flanged pulley E, as shown by Fig. 7. Both of the pulley-rims G and E consist in the rim or annulus a and flanges b, and they are respectively retained in place solely by the respective belts U" and V against the peripheries of the respective pulleys A B and D'E, as shownin Fig. 7, their oflice being solely to retain said belts against the peripheries of said pulleys, whereby each belt is adapted to rotate one of each pair of rolls in the same direction as a'provision against accident.

G is an automatically-closing door, which is secured to the case A at its lower edge by hinges d d, and is adapted to open outwardly. The respective sides of the door I are provided with triangular side flanges plates, H, which, when the door is thrown wise would, over the respective sides of the door.

To the inward projecting edges of the flanges plate J.

center of gravity is upon the opposite side of it will be automatically closed by the gravity .of said weight.

K K are reciprocating bars, for agitating feed-rolls,whereby it is caused tofiow uniformly therefrom to the feed-rolls. The bars K are centrally supported at their sides by the hangers L, which are rigidly affixed thereto. Holes are formed in the upper ends of the hangers L for the reception of the rods M", from which said hangers and bars are'suspended. The rods M are rigidly affixed at their ends to the sides of the hopper by nails or screws, as shown. The upper ends of the bars K are attached to the oscillating bracket N bylinks O O and pivotal bolts g'g. The bracket N is centrally supported at itslower end upon pivot P.

Between the arms h h of the bracket is an back and open, serve to prevent the flour. or ground material which clings to the back of l the door from falling to the floor, as it otherthe hinges or pivotal point from that ofthe j door, whereby as soon as the door is released 1 H is attached a weight, I, by means of the M The weight I is so arranged that when the door is open it still projects Within the shell in such a manner that the line of the the grain or materialin thehopper above the v eccentric, R, mounted upon the shaft Sand adapted to rotate with it. Thus as the shaft S rotates a rocking motion is communicated therefrom through said eccentric to said bracket, and as said bracket rocks on its supportit communicates a reciprocating motion to said agitating-bars K. Motion is communicated to the shaft S from the pulley Othrongh belt T and pulley U, and from thence to said cccentric and the agitating-bars, as mentioned.

The devices for scraping the grindingrolls (shown in Figs. 5 and 6) are supported. at their respective'ends, from the sides of the case A, by arms V V, and they consist in the screw threaded adjustable standards W W, handnuts Y Y and Z Z, spiral springs A, and plate B. The spiral springs support the standards and scrapingplates while they yield sufficiently to conform to any unevenness of the surface of the rolls without breaking the scrapers. The handnuts' Z Z limit the upward movement of the standards and plates caused by the springs, and serve in adjusting said plates to the rolls, whilethe hand-nuts Y ment such adjustable rolls are arranged upon the inside neXt to each other, by which ar- Y serve as bearings to the upper ends of the I of shaft M, handle N, eccentrics F F, screwrangement I am enabled to connect them with and simultaneously operate them and the feedrolls and band-tightener by a single lever, whereby, as said lever is thrown toward the right, the rolls are brought together in position for grinding, the feed-rolls are moved away from the mouths of the hopper, the hopper-throats are opened, the band-tightener is brought against the band, the feed-rolls are caused to rotate, and a reciprocating motion is communicated to the agitating-bars, thereby simultaneously starting all the operative mechanism, while by the reverse movement of said lever all the parts are reverse] y moved, the flow of grain or material is cut off, and the agitator and feed-rolls are stopped.

The eccentric journal-boxes O are preferably secured to the arms G in globe or spherical shaped bearings Q, as shown in Fig. 10, as they are thereby more readily fitted thereto or replaced. Cylindrical or other form of bearings may, however, be used. 'When the globe-bearings are used, the bearings of the arms G are made to conform in shape thereto.

Having thus described my invention, what I claim as new, and desire L0 secure by Letters Patent, is

1. In a roller-mill, the combination, with one end of each of theshafts of the adjustable rolls, of a spherical-shaped movable journal-box having an eccentric journal-bearing in which the journal of each shaft rotates, said journal-box being adapted to be both inclined and turned in its bearing in the supporting-arms, substantially as and for the purpose specified.

2. In a rollermill, the combination, with both ends of each of the two central rollshafts of the spherical-shaped movable journal-boxes O O, and with one end of each of said shafts, of eccentric joi'irnal-bearings in which the journal of each of such shafts rotates, adjustable arms G G, pivotal supports H H, and operating mechanism for adjusting the upper ends of the arms H H, substantially as set forth.

3. In a double-roller mill, the combination rods K K, arms G G, each carrying one end of the two central rolls, hand-nuts M M, springs N N, and pivotal supports H H, as set forth.

' 4:. In a double-roller mill, a single drivingbelt for'simultaneously rotating one of each of two pairs of grinding-rolls in the same direction, in combination with the fixed bandpulleys of such rolls, of a free open pulleyrim interposed partially between and held in contact with said fixed pulleys,a belt passing from the drive-shaft to and partially around and between said fixed pulleys,and nearly around said open pulley-rim and retaining [said rim against the belt on the peripheries of both of saidfixed pulleys, whereby said belt is retained in contact with and rotates both of said fixed pulleys in the same direction,as set forth.

5. In a double-roller mill, the combinatained in place against said pulleys D and E by said pulley-rim E, band-pulleys A and B, pulley-rim O, and driving-belt U,whereby the respective rolls in both pairs are rotated by separate bands in opposite directions toward each other, as set forth.

6. The combination, with a case, ofa roller-mill and a door hinged at its lower edge to such case and provided with vertical side plates, of a counterpoise rigidly affixed to said side plates within said case upon the opposite side of the center of gravity of said door, whereby it is adapted by its gravity to close said door upwardly, as set forth.

7. The devices for holding the scraping blades in contact with the grinding-'rolls,consisting in the combination,with the respective ends of said blades, of the screw-cut adjustable standards W 'W, adj ustiug hand-nuts Y and Z, springs A A, and supporting-arm V, substantially asset forth.

S. The combination, with the throat or discharge of the hopper of a roller-mill having rigid immovable sides,of an adjustable agitating-roil, movable bearings, and suitable adjusting mechanism therefor by which it is re tained in actual close contact with both sides of said throat as the hopper is closed, and removed as the hopper is opened, as set forth.

9. In a roller-mill, the combination of shaft M, handle N, eccentrics L, arm J, screw-rods K K, arms S S, pivotal supports H H, and

feed-rolls F F, said feed-rolls being adapted to be both simultaneously adjusted by moving said handle, as set forth.

10. The combination, with the hopper hav- IOC ing upwardly-converging bottoms O, and the 

